Telluric current also called(EARTH CURRENT), natural electric current flowing on and beneath the surface of the
Earth and generally following a direction parallel to the Earth's surface. Telluric currents arise
from charges moving to attain equilibrium between regions of differing electric potentials; these
differences in potential are set up by several conditions, including very lowfrequency
electromagnetic waves from space, particularly from the magnetosphere incident upon the
Earth's surface, and moving charged masses in the ionosphere and the atmosphere. Telluric
currents are often used by geophysicists to map subsurface structures, such as sedimentary
basins, layered rocks, and faults. An anomalous current density or gradient may be indicative
of a subsurface structural feature.
>Nasa Statement from there database:
FourDimensional Data Assimilation Objectives: FourDimensional Data Assimilation (4DDA) involves using climate models of the Earth System (atmosphere, land surface,
and ocean, i.e., climate models) and estimationtheoretical methods for melding observations into the model. 4DDA attempts to provide
the best estimate of the evolving state of the Earth System by extracting the maximum amount of information from the available
observations.
telluric lines: Absorption lines in a solar spectrum produced by constituents of the atmosphere of the earth itself rather than by gases in the outer
solar atmosphere such as those responsible for the Fraunhofer lines. The terrestrial nature of the absorption processes responsible
for telluric lines is revealed by their intensity variation with solar zenith angle and by their freedom from any Doppler broadening
due to their solar rotation. Water vapor produces the strongest of the telluric lines in the visible spectrum. http://home.netcom.com/~trifonov/ams/home.html Monocosm:Why does the World look fourdimensional? Linear Xenology: A ToposTheoretic Approach to the Foundations of Physics The FourDimensionality Problem  Why does spacetime look fourdimensional?; This problem is related to the
Compactification Problem. The Effective Signature Problems  Why is the metric of signature 2 (Lorentzian)? Physicists can be divided into three major categories (with some overlapping) according to their view of the problems: Optimists  "The problems are fundamental and the current (very successful) paradigm will eventually solve them". Pragmatists  "The problems are important, but the solutions are not desperately needed as long as the current
paradigm works". Pessimists  "The problems may have no solution within GaugeGrassmannian Physics: many have tried (including
several boygeniuses). The situation begins to resemble the Black Body Radiation vs Classical Physics(Not to mention all dark matter is cold atoms where space time is slowbkparque)
conflict". The Pessimists point out that the theory is studied well enough to see that there is no automatic compactification machanism,
so observable d=4; sig=2 remain axioms. These axioms are implicitly used in a typical Optimist's solution attempt which
has the standard form: spacetime is 4d because only in 4d a certain condition X is satisfied (the Optimists usually do not
even address the Effective Signature Problem). The Pessimists consider this not a solution of the 4d problem but a mere
statement about uniqueness of 4d with respect to X. They argue that it is already well established that 4d is unique in many
respects  the Question is Why?. The Pessimists believe the main cause for the confusion is that the problems are not posed
with sufficient rigor (say, topology level) , and some formal "pregeometric" concepts logically prior to physics may be
required. Currently the only solution of the FourDimensionality Problem published in physics literature is due to a pessimist ,
yours truly, Vladimir Trifonov, "A Linear Solution of the FourDimensionality Problem", EUROPHYSICS LETTERS
32 (8), 1995, pp. 621626 (if you know of any other solutions, please give me a buzz). The paper presents the first
rigorous formulation of the problem,
based on a classification of the
Heyting algebras of the observer's
topoi of Msystems. It also offers a
solution of the Effective Signature
Problem (which, btw, may be related
to the Problem of Time), giving a
curious reconstruction of Special
Relativity out of categorytheoretic
principles. Roughly, the Answer is this: spacetime is perceived 4d and Lorentzian because the operational logic of the
observer is bivalent Boolean. The paper contains a selfdestruction test predicting a rather special cosmological model  the
funnel cosmology with =crit (the universe opens up in time, spacelike hypersurface still being compact) and
SU(2)xR+ shape (funnel), with accelerating expansion. The integration over the Funnel is noncommutative (Haar), which,
btw, may have some relation to the nonNewtonian behavior of galaxies and clusters (the dark matter effect)  see Haar
Measure and Geodesics in Funnel Cosmology. Among other interesting results are automatic generation of the standard Hilbert structure of Quaternionic Quantum
Mechanics, and, especially intriguing: classical mathematics (i.e. the topos of sets) does not appear to be the natural math of
our universe. Some of the paper's results are discussed in The Klymene Principle by R.Zimmermann and also in: A.K. Guts and E.B.
Grinkevich, "Toposes in General Relativity" (grqc/9610073); A.K. Guts and A.A. Zvyagintsev, "Solution of the vacuum
Einstein equations in Synthetic Differential Geometry of KockLawvere" (physics/990916); I. Raptis, "A NonClassical
Linear Xenomorph as a Model for Quantum Causal Space" (grqc/9909056); A.K. Guts and A.A. Zvyagintsev,
"Interpretation of intuitionistic solution of the vacuum Einstein equations in smooth topos" (grqc/0001076). telluric lines Absorption lines in a solar spectrum produced by constituents of the atmosphere of the earth itself rather than by gases in the outer
solar atmosphere such as those responsible for the Fraunhofer lines. The terrestrial nature of the absorption processes responsible
for telluric lines is revealed by their intensity variation with solar zenith angle and by their freedom from any Doppler broadening
due to their solar rotation. Water vapor produces the strongest of the telluric lines in the visible spectrum. Why Monocosm? Monocosm is the operational philosophy of Linear Xenology  a possibleworlds (in the spirit of Leibniz) approach to the
foundations of physics. The term "monocosm" was invented by the late Strugatsky Bros. See "The Time Wanderers" (Russian edition title:
"Volny gasyat veter"  "The Waves extinguish the Wind").(Be nice to all peoples and animals of the earth and other worlds) http://home.netcom.com/~trifonov/rwmath.html
